Sun display, grid issues, and input validation fixed.

-Restored ugly but required defaults :)
-Moved control display to lower right of screen so we don't hide error
dialogs if invalid values are entered.
-Fixed code to determine grid spacing when not set to integer divisor of
180.  Also made 180 work and added missing valid values.
-sun position displayed and moved about as degrees longitude
-added sun position indicator on grid.
-cleaned up some unused